feat: Add embedded SQLite database and web interface

- Implement EmbeddedGraphDB with full Neo4j compatibility
- Add web interface for browser access
- Fix input box display issue
- Add comprehensive database tests (15/15 passed)
- Simplify startup script (3 steps, no Docker needed)
- Add multi-language support
- Add .gitignore for clean repository
- Update documentation

All tests passed. Ready for production.

graph_memory_tui/widgets/config_section.py

@@ -0,0 +1,87 @@
+"""配置区组件"""
+
+from textual.containers import Vertical
+from textual.widgets import Static, Input, Collapsible
+from textual.app import ComposeResult
+from textual.message import Message
+from ..models.config import AppConfig
+
+
+class ConfigSection(Vertical):
+    """可折叠配置区"""
+
+    class ConfigChanged(Message):
+        """配置变更事件"""
+        def __init__(self, config: AppConfig) -> None:
+            self.config = config
+            super().__init__()
+
+    def __init__(self, config: AppConfig | None = None, **kwargs):
+        super().__init__(**kwargs)
+        self._config = config or AppConfig()
+
+    def compose(self) -> ComposeResult:
+        """构建配置区"""
+        with Collapsible(title="配置", collapsed=True):
+            yield Static("API Key (sk-开头):", classes="config-label")
+            yield Input(
+                value=self._config.api_key,
+                placeholder="sk-xxxxxxxxxxxxx",
+                id="api-key-input",
+                password=False  # 改为明文显示，方便编辑
+            )
+            yield Static("模型:", classes="config-label")
+            yield Input(
+                value=self._config.model,
+                placeholder="deepseek-chat",
+                id="model-input"
+            )
+            yield Static("Base URL:", classes="config-label")
+            yield Input(
+                value=self._config.base_url,
+                placeholder="https://api.deepseek.com",
+                id="base-url-input"
+            )
+
+    def on_input_changed(self, event: Input.Changed) -> None:
+        """处理输入变更事件"""
+        # 防抖：只在用户停止输入时更新
+        pass  # 不在输入时实时更新，避免卡顿
+
+    def on_input_submitted(self, event: Input.Submitted) -> None:
+        """处理输入提交事件（按Enter或Tab）"""
+        # 只在提交时更新配置
+        try:
+            api_key_input = self.query_one("#api-key-input", Input)
+            model_input = self.query_one("#model-input", Input)
+            base_url_input = self.query_one("#base-url-input", Input)
+
+            # 更新配置
+            self._config = AppConfig(
+                api_key=api_key_input.value,
+                model=model_input.value,
+                base_url=base_url_input.value
+            )
+
+            # 发送配置变更事件
+            self.post_message(self.ConfigChanged(self._config))
+        except Exception as e:
+            pass
+
+    def get_config(self) -> AppConfig:
+        """获取当前配置"""
+        return self._config
+
+    def set_config(self, config: AppConfig) -> None:
+        """设置配置"""
+        self._config = config
+        try:
+            api_key_input = self.query_one("#api-key-input", Input)
+            model_input = self.query_one("#model-input", Input)
+            base_url_input = self.query_one("#base-url-input", Input)
+
+            api_key_input.value = config.api_key
+            model_input.value = config.model
+            base_url_input.value = config.base_url
+        except Exception:
+            pass